of a long chain fatty acid was dissolved in of hexane. of this solution was added dropwise to the surface of water in a round watch glass. Hexane evaporates and a monolayer is formed. The distance f

Question

of a long chain fatty acid was dissolved in  of hexane.  of this solution was added dropwise to the surface of water in a round watch glass. Hexane evaporates and a monolayer is formed. The distance from edge to centre of the watch glass is . What is the height of the monolayer? [Density of fatty acid ; ]

Canvas Classes · Accepted Answer

Strategy:
 Calculate the total volume of the fatty acid added in the 10 mL aliquot. Since it forms a monolayer, the height of the layer is simply the volume divided by the surface area of the watch glass.

Step 1: Calculate mass in the aliquot
Concentration .
Mass in .

Step 2: Calculate volume of fatty acid
Density .

Step 3: Calculate surface area and height
Radius . Area .

Converting to meters: .

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